Buggy code:
options . put ( FORMATTER_INSERT_SPACE_BEFORE_COMMA_IN_CONSTRUCTOR_ARGUMENTS , ( this . insert_space_before_comma_in_constructor_arguments ? JavaCore . INSERT : JavaCore . DO_NOT_INSERT ) ) ; options . put ( FORMATTER_INSERT_SPACE_AFTER_COMMA_IN_CONSTRUCTOR_ARGUMENTS , ( this . insert_space_after_comma_in_constructor_arguments ? JavaCore . INSERT : JavaCore . DO_NOT_INSERT ) ) ; options . put ( FORMATTER_INSERT_SPACE_BEFORE_COMMA_IN_CONSTRUCTOR_THROWS , ( this . insert_space_before_comma_in_constructor_throws ? JavaCore . INSERT : JavaCore . DO_NOT_INSERT ) ) ; options . put ( FORMATTER_INSERT_SPACE_AFTER_COMMA_IN_CONSTRUCTOR_THROWS , ( this . insert_space_after_comma_in_constructor_throws ? JavaCore . INSERT : JavaCore . DO_NOT_INSERT ) ) ; options . put ( DefaultCodeFormatterConstants . FORMATTER_INSERT_SPACE_BEFORE_COMMA_IN_FOR_INCREMENTS , ( this . insert_space_before_comma_in_for_increments ? JavaCore . INSERT : JavaCore . DO_NOT_INSERT ) ) ; options . put ( DefaultCodeFormatterConstants . FORMATTER_INSERT_SPACE_AFTER_COMMA_IN_FOR_INCREMENTS , ( this . insert_space_after_comma_in_for_increments ? JavaCore . INSERT : JavaCore . DO_NOT_INSERT ) ) ; options . put ( FORMATTER_INSERT_SPACE_BEFORE_COMMA_IN_EXPLICITCONSTRUCTORCALL_ARGUMENTS , ( this . insert_space_before_comma_in_explicitconstructorcall_arguments ? JavaCore . INSERT : JavaCore . DO_NOT_INSERT ) ) ; options . put ( FORMATTER_INSERT_SPACE_AFTER_COMMA_IN_EXPLICITCONSTRUCTORCALL_ARGUMENTS , ( this . insert_space_after_comma_in_explicitconstructorcall_arguments ? JavaCore . INSERT : JavaCore . DO_NOT_INSERT ) ) ; options . put ( DefaultCodeFormatterConstants . FORMATTER_INSERT_SPACE_BEFORE_COLON_IN_LABELED_STATEMENT , ( this . insert_space_before_colon_in_labeled_statement ? JavaCore . INSERT : JavaCore . DO_NOT_INSERT ) ) ; options . put ( DefaultCodeFormatterConstants . FORMATTER_INSERT_SPACE_AFTER_COLON_IN_LABELED_STATEMENT , ( this . insert_space_after_colon_in_labeled_statement ? JavaCore . INSERT : JavaCore . DO_NOT_INSERT ) ) ; options . put ( FORMATTER_INSERT_SPACE_BEFORE_COMMA_IN_MESSAGESEND_ARGUMENTS , ( this . insert_space_before_comma_in_messagesend_arguments ? JavaCore . INSERT : JavaCore . DO_NOT_INSERT ) ) ; options . put ( FORMATTER_INSERT_SPACE_AFTER_COMMA_IN_MESSAGESEND_ARGUMENTS , ( this . insert_space_after_comma_in_messagesend_arguments ? JavaCore . INSERT : JavaCore . DO_NOT_INSERT ) ) ; options . put ( FORMATTER_INSERT_SPACE_BEFORE_COMMA_IN_METHOD_ARGUMENTS , ( this . insert_space_before_comma_in_method_arguments ? JavaCore . INSERT : JavaCore . DO_NOT_INSERT ) ) ; options . put ( FORMATTER_INSERT_SPACE_AFTER_COMMA_IN_METHOD_ARGUMENTS , ( this . insert_space_after_comma_in_method_arguments ? JavaCore . INSERT : JavaCore . DO_NOT_INSERT ) ) ; options . put ( FORMATTER_INSERT_SPACE_BEFORE_COMMA_IN_METHOD_THROWS , ( this . insert_space_before_comma_in_method_throws ? JavaCore . INSERT : JavaCore . DO_NOT_INSERT ) ) ; options . put ( FORMATTER_INSERT_SPACE_AFTER_COMMA_IN_METHOD_THROWS , ( this . insert_space_after_comma_in_method_throws ? JavaCore . INSERT : JavaCore . DO_NOT_INSERT ) ) ; options . put ( DefaultCodeFormatterConstants . FORMATTER_INSERT_SPACE_BEFORE_COMMA_IN_MULTIPLE_LOCAL_DECLARATIONS , ( this . insert_space_before_comma_in_multiple_local_declarations ? JavaCore . INSERT : JavaCore . DO_NOT_INSERT ) ) ; options . put ( DefaultCodeFormatterConstants . FORMATTER_INSERT_SPACE_AFTER_COMMA_IN_MULTIPLE_LOCAL_DECLARATIONS , ( this . insert_space_after_comma_in_multiple_local_declarations ? JavaCore . INSERT : JavaCore . DO_NOT_INSERT ) ) ; options . put ( DefaultCodeFormatterConstants . FORMATTER_INSERT_SPACE_BEFORE_COMMA_IN_FOR_INITS , ( this . insert_space_before_comma_in_for_inits ? JavaCore . INSERT : JavaCore . DO_NOT_INSERT ) ) ; options . put ( DefaultCodeFormatterConstants . FORMATTER_INSERT_SPACE_AFTER_COMMA_IN_FOR_INITS , ( this . insert_space_after_comma_in_for_inits ? JavaCore . INSERT : JavaCore . DO_NOT_INSERT ) ) ; options . put ( DefaultCodeFormatterConstants . FORMATTER_INSERT_SPACE_AFTER_SEMICOLON_IN_FOR , ( this . insert_space_after_semicolon_in_for ? JavaCore . INSERT : JavaCore . DO_NOT_INSERT ) ) ; options . put ( DefaultCodeFormatterConstants . FORMATTER_INSERT_SPACE_BEFORE_POSTFIX_OPERATOR , ( this . insert_space_before_postfix_operator ? JavaCore . INSERT : JavaCore . DO_NOT_INSERT ) ) ; options . put ( DefaultCodeFormatterConstants . FORMATTER_INSERT_SPACE_AFTER_POSTFIX_OPERATOR , ( this . insert_space_after_postfix_operator ? JavaCore . INSERT : JavaCore . DO_NOT_INSERT ) ) ; options . put ( DefaultCodeFormatterConstants . FORMATTER_INSERT_SPACE_BEFORE_PREFIX_OPERATOR , ( this . insert_space_before_prefix_operator ? JavaCore . INSERT : JavaCore . DO_NOT_INSERT ) ) ; options . put ( DefaultCodeFormatterConstants . FORMATTER_INSERT_SPACE_AFTER_PREFIX_OPERATOR , ( this . insert_space_after_prefix_operator ? JavaCore . INSERT : JavaCore . DO_NOT_INSERT ) ) ; options . put ( DefaultCodeFormatterConstants . FORMATTER_INDENT_SWITCHSTATEMENTS_COMPARE_TO_SWITCH , ( this . indent_switchstatements_compare_to_switch ? DefaultCodeFormatterConstants . TRUE : DefaultCodeFormatterConstants . FALSE ) ) ; options . put ( DefaultCodeFormatterConstants . FORMATTER_INDENT_SWITCHSTATEMENTS_COMPARE_TO_CASES , ( this . indent_switchstatements_compare_to_cases ? DefaultCodeFormatterConstants . TRUE : DefaultCodeFormatterConstants . FALSE ) ) ; options . put ( DefaultCodeFormatterConstants . FORMATTER_INDENT_BREAKS_COMPARE_TO_CASES , ( this . indent_breaks_compare_to_cases ? DefaultCodeFormatterConstants . TRUE : DefaultCodeFormatterConstants . FALSE ) ) ; options . put ( FORMATTER_ANONYMOUS_TYPE_DECLARATION_BRACE_POSITION , this . anonymous_type_declaration_brace_position ) ; options . put ( FORMATTER_INSERT_SPACE_BEFORE_ANONYMOUS_TYPE_OPEN_BRACE , ( this . insert_space_before_anonymous_type_open_brace ? JavaCore . INSERT : JavaCore . DO_NOT_INSERT ) ) ; options . put ( DefaultCodeFormatterConstants . FORMATTER_INDENT_BODY_DECLARATIONS_COMPARE_TO_TYPE_HEADER , ( this . indent_body_declarations_compare_to_type_header ? DefaultCodeFormatterConstants . TRUE : DefaultCodeFormatterConstants . FALSE ) ) ; <START_BUG> options . put ( FORMATTER_FILLING_SPACE , Character . toString ( this . filling_space ) ) ; <END_BUG> options . put ( DefaultCodeFormatterConstants . FORMATTER_INSERT_SPACE_AFTER_CLOSING_PAREN_IN_CAST , ( this . insert_space_after_closing_paren_in_cast ? JavaCore . INSERT : JavaCore . DO_NOT_INSERT ) ) ; options . put ( FORMATTER_NUMBER_OF_BLANK_LINES_TO_INSERT_AT_BEGINNING_OF_METHOD_BODY , Integer . toString ( number_of_blank_lines_to_insert_at_beginning_of_method_body ) ) ; options . put ( DefaultCodeFormatterConstants . FORMATTER_KEEP_SIMPLE_IF_ON_ONE_LINE , ( this . keep_simple_if_on_one_line ? DefaultCodeFormatterConstants . TRUE : DefaultCodeFormatterConstants . FALSE ) ) ; options . put ( FORMATTER_FORMAT_GUARDIAN_CLAUSE_ON_ONE_LINE , ( this . format_guardian_clause_on_one_line ? DefaultCodeFormatterConstants . TRUE : DefaultCodeFormatterConstants . FALSE ) ) ; options . put ( FORMATTER_INSERT_SPACE_BEFORE_OPEN_PAREN_IN_PARENTHIZED_EXPRESSION , ( this . insert_space_before_open_paren_in_parenthesized_expression ? JavaCore . INSERT : JavaCore . DO_NOT_INSERT ) ) ; options . put ( FORMATTER_INSERT_SPACE_AFTER_OPEN_PAREN_IN_PARENTHIZED_EXPRESSION , ( this . insert_space_after_open_paren_in_parenthesized_expression ? JavaCore . INSERT : JavaCore . DO_NOT_INSERT ) ) ; options . put ( FORMATTER_INSERT_SPACE_BEFORE_CLOSING_PAREN_IN_PARENTHIZED_EXPRESSION , ( this . insert_space_before_closing_paren_in_parenthesized_expression ? JavaCore . INSERT : JavaCore . DO_NOT_INSERT ) ) ; options . put ( DefaultCodeFormatterConstants . FORMATTER_KEEP_THEN_STATEMENT_ON_SAME_LINE , ( this . keep_then_statement_on_same_line ? DefaultCodeFormatterConstants . TRUE : DefaultCodeFormatterConstants . FALSE ) ) ; options . put ( DefaultCodeFormatterConstants . FORMATTER_BLANK_LINES_BEFORE_NEW_CHUNK , Integer . toString ( this . blank_lines_before_new_chunk ) ) ; options . put ( DefaultCodeFormatterConstants . FORMATTER_BLANK_LINES_BEFORE_FIELD , Integer . toString ( this . blank_lines_before_field ) ) ; options . put ( DefaultCodeFormatterConstants . FORMATTER_BLANK_LINES_BEFORE_METHOD , Integer . toString ( this . blank_lines_before_method ) ) ; options . put ( DefaultCodeFormatterConstants . FORMATTER_BLANK_LINES_BEFORE_MEMBER_TYPE , Integer . toString ( this . blank_lines_before_member_type ) ) ; options . put ( FORMATTER_INSERT_SPACE_AFTER_BLOCK_CLOSE_BRACE , ( this . insert_space_after_block_close_brace ? JavaCore . INSERT : JavaCore . DO_NOT_INSERT ) ) ; options . put ( DefaultCodeFormatterConstants . FORMATTER_KEEP_ELSE_STATEMENT_ON_SAME_LINE , ( this . keep_else_statement_on_same_line ? DefaultCodeFormatterConstants . TRUE : DefaultCodeFormatterConstants . FALSE ) ) ; options . put ( FORMATTER_INSERT_SPACE_BEFORE_BRACKET_IN_ARRAY_TYPE_REFERENCE , ( this . insert_space_before_bracket_in_array_type_reference ? JavaCore . INSERT : JavaCore . DO_NOT_INSERT ) ) ;

Fix:
options . put ( FORMATTER_FILLING_SPACE , String . valueOf ( this . filling_space ) ) ;